Just as a test, added a third screen with graphics.

include/screens.h

@@ -0,0 +1,10 @@
+#ifndef SCREENS_H
+#define SCREENS_H
+
+#include <U8g2lib.h>
+
+void drawScreen1(U8G2 &u8g2);
+void drawScreen2(U8G2 &u8g2);
+void drawWeatherIconScreen(U8G2 &u8g2);
+
+#endif